Should central banks intervene in currency markets? In theory, within a flexible system, central banks should leave the process of determining appropriate exchange rates to the currency markets. In practice, however, central banks have frequently intervened to 'manage' the exchange rates...

Leaving foreign exchange markets to themselves may not lead to realistic and stable exchange rates. Thus appropriate criteria for interference must be defined. The OPTICA (Optimal Currency Area) Group which was appointed by the European Commission tried to work out appropriate rules for the EC....